o) Why can't I playing some YouTube videos (HTML5 error) and where can I get the codecs to run H.264 videos? Solution
General (CentOS, Fedora, Ubuntu, Debian, Manjaro, ...):
o) Kernel panic error (sync fail) at various distributions when starting the installation:
I don't know exactly why this error occures but I found a solution which is working for me:
Edit the GRUB bootloader entry and attach the following parameters (you have to use all 3!):
acpi=off noapic nomodeset
Now the kernel should boot without an error. I'll hope this will help you! It worked for me at CentOS 7 and Ubuntu Server 18.04.